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© Unknown. Megalithic temple of Hagar Qim still stands above the ground some 20 km to the South of Hypogeum of Hal Saflieni.
Tradition holds that before the British government sealed up several tunnels, one could walk from one end of Malta to the other underground. One of the labyrinths, discovered by excavators, is the Hypogeum of Hal Saflieni, in which excavators discovered the bones of over 33,000 people who had been sacrificed by an ancient pagan neolithic cult.National Geographic, Aug. 1940 issue, told of several school children who had disappeared without a trace in the Hypogeum.

British embassy worker Miss Lois Jessup convinced a guide to allow her to explore a 3-ft. square "burial chamber" next to the floor of the lowest room in the last [3rd] sub-level of the catacombs. He reluctantly agreed and she crawled through the passage until emerging on a cavern ledge overlooking a deep chasm. In total shock she saw a procession of TALL humanoids with white hair covering their bodies walking along another ledge about 50 feet down on the opposite wall of the chasm.

Sensing her they collectively lifted their palms in her direction at which a strong "wind" began to blow through the cavern and something big, "slippery and wet" moved past her before she left in terror to the lower room, where the guide gave her a "knowing" look. Later she returned after the 30 school children and their teacher[s] had disappeared in the same passage that she had explored, only to find a new guide who denied any knowledge of the former guides' employment there.

She heard reports however that after the last child had passed through the "burial chamber" and out onto the ledge, a "cave-in" collapsed the burial chamber and the rope connecting them to the lower chamber was later found to be "cut clean". Grieving Mothers of several of the children swore that for a week or more following the disappearance they could hear theirchildren crying and screaming "as if from underground". Other sources state that an underground connection exists or did exist between Malta and reaches hundreds of miles and intersects the catacombs below the hill Vaticanus in Rome.
Source: The Reality Of The Cavern World, by Riley Crabb; Commander X; NATIONAL GEOGRAPHIC magazine, Aug. 1940